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Behind the scenes

This character appears only on the version of the Black family tree shown in the film adaptation of Harry Potter and the Order of the Phoenix. He was not included on the version of the tree which J. K. Rowling gave to a charity auction in 2006.[2] However, according to director David Yates, Rowling provided the filmmakers with a copy of the Black family tree going back eight generations.[3] The filmmakers presumably received a more complete version of the tree than the one auctioned off, which only goes back six generations.

If Elladora was Cygnus' daughter, that means that he died after she was born, because she was the youngest child in the family.

Based on a statement of Horace Slughorn, Cygnus may have been a member of Slytherin House. However, he attended Hogwarts c. 1840 - 1847, when Slughorn was not Potions teacher.

Etymology

Cygnus means "swan". The Grandson of Cygnus I is named after him. Cygnus is also the name of a constellation in the Northern Hemisphere near Lacerta and Lyra, containing the star Deneb. Also called Northern Cross amd Swan.